Gear-generating machine



At ALEXAY.

GEAR GENERAUNG NIAGHlNE.

,APPLICANON FILED JAN.28, 1920.

1,408,792. Patente@ Mar. 7,

3 SHEETS-SHEETI f5 si 50 A. ALEXAY.

GEAR GENERATING MACHINE. APPLICATION f'|LED'1AN.2s, 1920.

Patnted Miu'. 7, 1929.

INVENTGR ATTORNEY A. AILEXAY. vGEAR GEAERATING MAcHlNE'. APPLICATION man JAS. la. m2o.

Lmg'fmg, ,Patented Mm-.,7, 1922.

3 SHEETSHSHEET 3.

i, x 122%@ j j INVENTOR ATTORNEY l tion is an ?5 Further to provide a` machine that 35 siied conical pitch.

55 alle iiian adjustable ADALBERT .ALEXAEL OF AVENEL, NEW FEES l?.

GEAR-GENERATING MACHINE 1,408,792. i application sied To all fau/m it may cancer-n.' Y

Be it known that I, ADALBERT ALEXAY, a subject citizenof Hungary, and a. resident of Aveiiel, county of Middlesex, and State 5 of New Jersey, have invented certain new and useful Improvements in Gear-Generating Machines, of which the following is a full, clear, and exactdescription.

. is invention relates to gear cutting inatype of machine pur gears have heretofore been produced l by a hob ing process, and the present inven application ot' the hobbing principle to the production of curved tooth beveled gears, so that a gear oi this type. may be produced complete in a single ,cycle ot' operations and with precision in any size and 20 conical pitch.

e presentinvention aims to provide a. machine of the type mentioned which is simple in construction,` reliable in and o operation, inexpensive to build.

will cutI curved teeth of, iiivolute form on bevel gears and with provision for adjustment to cut oppositely curved teeth Without the necessity of re-setting the cutting-tools heretofore a source ot inaccuracy in making a pair of mating or intermeshingy bevel fgears.

Still turther it aims to provide in such a. machine adjustments permitting gears to be cut with any suitable number of teeth and -at any de- Also it contemplates adjustments easily suit the feed of the cutters into'tlie blank. And further manufacture of any sized gear and without the necessity `of substituting change gears.

The invention consists essentially in rotating a gear blank in the path of a plurality ot' ing crown and bevel gears, the last namedI movement insuring profile generation` i. e., radial shaping ot' the sides of teeth. ln a. preferred embodiment ot the invention the gear blank is supported on a revolvable spinhead, which may be poangular relations to a cutter. The cutter conisitioned in various rotating and rolling Specification of Zetters Patent.

,ity of similar cutting blades in Patented T?. il@

January 28, 1920. Serial No. 854,544.

prises a head carrying a plurality of blades which are revolved about av common anis and wh rolled by being moved in a circular path. The work spindle andthe cutter spindle are revolved at definite angular velocities, that of the spindle being velocity necessary to insure indexing plus or minus (as the case may be) the angular velocity necessary to roll the blank in proper proportion to the roll-of the cutters. The various motions are derived shaft through suitable 'trains of gearing h are changeable to enable ditn ferent sized gears to be made, and between the means for moving bodily in a circular path Work spindle ing device which may be tialleveif.

These are the objects of my invention., but other objects will appear in thev following detailed description of the ei'nbodiinent thereof shown in the accompanying drawmis, in which.` y

ig. l is a sectional side elevation;

Fig, 2 is'the top plan "view,'v

Fig. 3 is a diagrammatic illustration ot' a lever forming part of the diiierential mechanism governing the relative profile gener ating movement o.' the blank and cutter;

Figs. 4 and 5 are end elevations from the lett and right ,respectively or" Fig. Q;

i "ig, 6 is ar detail in vertical section of the the cutter spindle' pivotal support for the lever diagramined in `Fig. 3 g

Fig-7 isa detail in horizontal section oi an articulated connection between the diifeiential lever and a driving screw therefor.

Fig. 8 illustrates in section the gez blank and cutter ,head in (nierative relation and shows in detail an improved form ot gearing within the cutter head for setting a plural one operation;

Fig. repnesents more or inatically the relation of the and blank viewed' anially ot i rear ot the cutter head with .i crown gear appearing in dotted F ig. l0 represents diagrammatically a cutter functioning in the imaginary crown gear on an oppose blank shown tlat for the sakeoit elearness;

Fig. ll illustrates how a pair ot the cutters travel in paths coincident with the faces oil.

a. tooth ot an imaginary crown gear.

saine .manner an gear shaft l1 is a spiral by ai gear i9 supported by a Fil? ln the embodiment of the invention illustrated and referring to Fig. 1 `for the present-,the blanlr 3 is supported on an arbor 5 and clamped thereto by a removable horse shoe washer d on the end oi a rod 19 Whose opposite end is threaded to receive the hand wheel 18 tor clamping?T the blanlt firmly to the arbor. rihe tapered end ot the arbor 5 is soclreted in a 'flanged tubular spindle y10 which is journaled in standards 152 and 1d. collar 9 conines the flanged tubular spindie 10 against endwise movement. The standard 12 rests upon the top 1 oi' a trarne il and its base has plate lilte extension 1:2 by which the standard is hinged 'for rnovenient about a, vertical axis ot the machine as will be hereinafter described.l rl`he platelike portion 12 is provided with a 'lslot 12 for a 'l'ebolit 15 adjustably securing the two Standards together, and permittingr the apex oit the pitch or rootconc of any bevel gear blanlr to be located in intersecting rela-tion with the perpendicular axis oi the machine which lies in the plane of rotation oi the cuttingA points ot the tools as shown in Fig. S, rllhe standards 12 and 14 together constitute a s fivel head which is adjustably clamped to the top 1 ot the Vtrarne in any necessary posit-ion by clamps indicated at 138, Fig. 1.

The tubular worlr spindle 10 is rotated by a Worm `gear 11 which is feathered thereto by the key 13, a lnishing 11 integral with or otherwise lined to the worm gear 11 being coniined by the collar against the adjacent portions oir' the Standard 12. The

worm wheel 11 is rotated by a worm on the vertical shaft 9.0 which is driven by a spiral fear 24 slidably lreyed thereto7 the latter gear beingA in turn. driven by a spiral gear 22 fired to a shatt Zl1 which is Supported by brackets flfll that are fixed relative to and there'tore movable with tlie shittable head 12-112l fear 4.4: which is driven collar 51 but itself loose on a perpendicular spindle 52 whose anis constitutes the bctore-1nentioned perpendicular axis oit' the machine in which theape; of the blanlrs root-cone is located.

The spiral rear 49 (see now Fig. 2) is driven by gear 134i, on one end et a shaft 62 which is supported by braclrets 19-65 suitably lined" to the traine and which is driven through spur gears ti?, and 100. The spur gear 100 is fast on the/end oi a counter-shaft 79 on the opposite end of which is a 80 corr nccted by change gear l1 to a gear 6T which is tast on the main shaft 88 adapted to be driven through the thereto 'fast belt pulley The rear i1 is supported on a stud Tl which is clamped by iosition in a slot in the bracket arm 70. Through the above described foi'inections the ge r blank 5l is driven from the main shaft oi the machine at a definite angular velocity tiene @n the opposite end oi' thel .rolling or profile the cutters, "which,

which may be varied by changing the gears 80, T1, 6T to get the required angular velocity. A

iin even plurality 'of cutters 109, 111, oi the circular type illustrated best in Figs. S and 1. are secured to a cutter head 105 equal distances apart and with the pitch line point on their inclined cutting edges in axial alignment with their central supporting; studs which are socketed in the cuttingr 'head 105 and fixed in place by set screws 106. The cutter head 105 is threaded or otherwise suitably'secured to the end of a cutting spindle 94 which is journaled in a bushing 101 and rotated through. a gear 93 fast on its opposite endand an idler 95., by a pinion 9G on the main idler 95 is supported on a stud 155 (see Fig. 5) projecting laterally from. a bracket 98 which is adjustably secured by a serew and slot connection 97 `to aworm wheel 120. The bushing spindle 94 is journaled eccentricaily in a quill 121, which in turn is journaled ec centrically in the worm wheel 120. The worin wheel 120 is rotatably housed in a stationary casing 131 and confined against lateral or axial displacement by a flange 103 screwed as indicated at 10:2 to the casing.

The quill 121 is flanged at its end 'cent the cutters as illustrated and is adjustably secured .in position in ther worm wheel 19.0 by a plate and screw 99. the plate 90 being provided marginally with a scale and resting against the worin 120 and permitting' the screw 99 to draw thefiianged quill 121 tightly against the body of the worin.. The bushing. 101 which rotatably supports the cutter spindle 94; in the quill is held against axial displacement by loch nuts 91 and 104C which incidently4 dugment the binding of the quill'121 to the worin 120.

Through the above-described connections it will be seen thatthe cutting blades on the cutting able angular velocity by the planetary lcrearing 96, which latter is changeable. lt` will also be noticed that the quill 121 per mits varying thel eccentric disposition ot the cutter spindle 94 and this. as will presently appear, more clearly permits of varying; the generating movement oi inftraversing the blank describe paths collectively conforming; to an imaginary crown gear tooth in moving from initial to full interineshing relation with its conjugate bevel gear.

lt will be understood that the means above-described will 'perniit of rotating the near blanlr at such an angular velocity relathe nut "l in any desired jtive to the rot-atingcuttezls as ,to insure the entrance of the cutters successively into the tooth spaces, thereby` zindexing the blank relative to the cutter.,V lin order to cut the. teeth to the proper :shape in profile it is head may berotated at a suit- 1 shaft 08. The l 101 sustaining .the cutting.

lill) incarne L@ necessary to modii'y the angular velocities of jecting laterally from the nut 55 is a shoultne blank 'and tbe Cutter by Compounding dered stud' 55 which has a nut 54 threaded with" their indexing-- nioveinent a 'rolling on its free end and is embraced by a bushing movement which generally known in the 151 having` arallel fiat faces slidable in a e art asa profile generating movement. slot 56 provided in a lever 56. The lever 'ye ln' the, lmachine illustrated this i's accom- 56 is fulcrumed intermediate its ends on a plished by driving the worm wheel or ,body pin 36, and the yoke shaped opposite ex- 120 througha worm 119 on' one end of a treniity of the lever is provided with trunsliait 135 whose opposite end carries a worm nion pins 38 entering a collar 28 loose on the wbleei 113 driven .in turn by a worm 60 on worm shat't20, but confined against axial 75 one end ci? a sha1-'t 61, supported by brackets displacement thereof by collars 27 and 29 132-4133,r whose opposite end is operatively which are secured to the shaft 20. connectedlby a set df cha-nge gears .141083A The fulcruin 36 for the lever 56 is of the 31, to the 'before-mentioned Yshaft 62. The special construction shown best in detail 'in i wurm wheel 118 on the rear end ot' shaft 6, the pin 36 being embraced by a bush# 80 135 is secured b'y the set screw 159, which ing 35 having fiat diametrically opposed may be loosened to permit manual rotafaces engaged by t e opposed walls of an tion thereof in either direction to initially elongated slot in the lever 5G. The pin 3G set the machine. Through the connections is adjustable in a slot 34 provided in the just mentioned the wormvfheel 120 may be trame 33 and may be clamped in position 85 .revolved at any/.suitable speed, which will 'therein by the nut 148 on its opposite free course be very low as it feeds the cutters end, which bears against the split nut 1417 :into the work, to cause the@ cutter axis 94 liavinga projecting port-ion entering the slot to travel in the arc of a circ-le about the axis 33. Fast on the fulcrum pin 36 is a plate 35 et the worm wheel 120, which is coincident 46 having a nut-like projection also entering 90 with the 'of the main shaft 88. The the recess 33 of the trame lThe plate 46 axis oi shaft 88 intersects at right angles is scored orconvenience in locating the pin the axis cit' the vertical spindle 52 beore- 36 in the slot 34 which isparalleled by a mentioned. scale45. Between the last-mentioned device au The profile generating movement oi' the and the nut148- the fulcrum pin 36 may be e5 blanlrj is derived trom the slowly turning securely held after location in any desired worm wheel 12() as seen from Fi y 2. The position. To locate the fulcrum pin 35 to connections for accomplishing this include the exact position requiredthe split nut 147 pinion 127 fixed to the shaft 135 in the rear is adapted to receive an adjusting screw 30,

of the worin wheel 118 and an idler 128 which is providedfwith ascale 32, thus func- 100 pivotaily supported on stud 129 projecting tioning as .a micrometer and permitting from thebracket 136, which in turn is adgreat accuracy in setting. justably secured to the bracket 144C fixed to ln Fig. 3 the lever 56 vis illustrated diathe trame ofthe machine. W ith the idler grammatically. Q, represents the adjustable et 123 meshes the spur gear 112 on the rear end ulcrum oi shaft 114 which is journaled in brackets and sliding, connections respectively with 113 and 141- suitably fixed to the frame oi" the axiaily s'hiitable worm shaft 20 and the the machine. 0n the forward end of shaft non-axia'lly--ifnovable but threaded drive 114 is a spiral gear 122 which driveslthe spindle 52, the axes of which are arallel.

et skew gear 123, Fig. 1, fast on the spindle As the triangles P, Q, S and Q, K are 52 whose upper end journaled in a flanged always similar no matter what positions the bushing 125 confined by the collar i8 and an lever occupies, their sides are always in prointervening collar portion 33 of a bracketportion, therefore, X is to Y as K, M, is to trame 33 to' the top ot the machine frame 2, P, S. By adjusting the fulcrum pin 36 to te the lower lend of the spindle 52 being liourthe proper position on the scale it will there- 115 naled in the base of thev machine frame 2 fore be seen that gear blanks ot' various and heldl against axial displacement by the sizes may be rolled exactly `in'constant prolixed collar 58 and wear washer 57. `0n this portion to the cutters and consequently that bushing 125 the swivel-head 12-14 prean exact prole generation may be obtained.

55 vic-usly .mentioned swings or 'pivots as does It. will thus be'seen that the worm shaft 120 also the bracket-trame 33 which is fixed to 20 simultaneously transmits two motions to the standard 12 by bolt 154, F 1. The the blank being cut, an indexing movement spindle 59 is threaded intermediately for a by rotation about its own axis and a profile portion ot its length as indicated in Fig. 1 generating movement by endwise or axial for'gthe lever and P and K the fixed 105 j ec and its threads are embraced by a split nut displacement, the two motions being com- 125 which is notched as indicated in Fig. 7 pounded. The worm shaft 2() therefore,

to receive a vertical guide edge 33 of the functions as a combined worm and rack brac t t 33. This edge 33 restrains driver of the worm gear 11 which directly the split nut against rotation and allows it drives the spindle 10 constituting the blank i5 to'move only axially ct the spindle 52. Procarrier.

llt)

Referring to Fig. 8 it will be noticed that the cutting blades 109--111 are ot a dat right-conical form being centrally and adjustably clamped by bolt and nut 107 to a holder 108 having a stud 108 secured in any desired position by set screw 10G. The cutting edges of the blades are formed to one side of their center, i. e. the cutting edges are not located` radially of their axial support. These `cutting edges are also inclined to the axis or' the cutter spindle when viewed in end elevation as shown at the right of Fig. 8. It is tov be noticed however, that the cutting edges on blades 109-111 are inclined oppositely to each other and with respect to the axis of the cutter spindle 9e.,

and this opposite inclination is necessary m.

order to cut the convex and concave sides of contiguous teeth. The requisite clearance in rear of the cutting edges is ali'orded by blades and by the location of the on opposite sides traversed by the body of of the circular path p itch point on thecutting edges yo each t the pitch point being in` dicatcd in Fig. l8 at the intersection 'et axial line G-G with line pp. f

ln Fig. Sthe studs 108 ot the several holders for the'blades are shown each provided `with gears* 164-465, the former connected tojolades 109 and meshing `with e gear16Lloosely, supported Within the cutter head 105 and the latterconnected to blades `111 and meshing with` a similar gear 166. yThrough these gears adjustment of one cut-- terabout the axis of its supporting stud 108'" willset all similar gears. And `thus by adj'usting one of each set of right anddcit cutters, all cutters may be properly positioned in, roughly speaking, tangential relation to their circular path of movement.

lf desired a packing or otherlibrous material 115, see Fig. 1in acup 116 under the actionI of a compression spring 117 housed in a socket in the be provided to reduce, it not eliminate, chattering of the cutters ad they successively engage the blank. y

ln operation, the gear blank 3 is posi tioned on the arbor 5 and clamped 'to the Work spindle by drawing up on horseshoe Washer 4 vthrough rod 19 and hand Wheel 18. Eccentric 121 is adjusted .relative to the axis oi the quilLor Worm 120 to so locate the cutters that they will vmotion oftheteeth on an imaginary crown just-ed to give the necessary angular veloci.- ties to the cutter and work spindles to insure indexing. A desirable roll is also allowed for the cutter spindle 94:, this roll being the rotile generating movement ot the cutters and incidently it constitutesy the feed for carrying the cutters gradually into the Work.

Aof Ytwo intermeshing beveled gears alternate "blades i eccentric 121 may duplicate the rolling ricerca 1When the machine has been properly adjusted in the manner above-described with the shittable head lil-111 secured lin posi-- tion with the root-cone of the blank sub stantially tangent to the plane in which the ends ofthe cutters rotate, the machine is started to operating and continues uninterrupdly until the gear is formed with all of its teeth complete, it being understood that the continuously rotating cutters are gradually fed further and further into the blank by their prolile generating movement in the same manner .as a single toothcn one moves trom initial to with its mating gear. y

In Fig. 9 the relative directions oi motion. of a blank, cutting blades, and cutter spindle are shown by arrows 160, 157 and 15S respectively. The gears 16d and their common adjusting gear 167, and likewise 'the ears 165 and their common adjusting gear 166 are illustrated this figure in dotted lines.

The machine above described in detail op crates upon the principle of conjugate crown and, bevel gears, the cutting edges ci the blades describing lpaths when they cross the gear blank, that correspond to the teeth ouV a crown gear, and these paths are inclined by reason of the rolling or profile generating iiull engaging relationmcwernent imparted. to the blank and cutter spindles in exactly the same manner as a. single tooth on the crown gear is inclined in moving relation with a conjugate. bevel gear. The crown gear is illustrated in Fig 9 by taint dash lines, its outermost edge being indi-- cated by the numeral'l and tivo ol? its teeth being illustrated inf cross-section at S and S. The cutter spindle 94: in Fig. 9 is shown to be coincident with the median circle ot the imaginary crown gear and the arrow 158 indicates the direction of roll. By consideration ci' this figure the theory action will be apparent.

lll/'bile only four cutters are'shou'n in the preferred form of the invent-loin it will be obvious that any. even' plurality of cutters may be employed. ln l41 ig. lll such a greater even plurality of cutters is illustrated in operative relation with a gear blank. which is for convenience shown in opposed parallel relation to the cutters. The arrows 162 and 163 indicate the directions in which the cut ters and blank rotate and the axis about which the cutters rot-ate is indicated at G. ln Fig. 10 the cutter F is shown inst engaging the conve-X side of a toothl and the cutter G leaving a tooth space after having from initial to full intermeshing of the cutting lll() ture. It will be noticed the ulpper portion of their circular path.

.' For cutting oppositely furved teeth on a beveled gear to mesh with that illustrated in solid lines in Fig. l0, cutter spindle 94 is shifted about 90o, so that the cutters may traverse the gear blank in the lovver portion ot" their circular path of movement. In F ig. l0 this is illustrated graphically, Athe cutter spindle being indicated at ycircular path of the cutters being indicated by the arrow 168, and one side of the oppoe vthe preferred torm of 5 l claim as new multaneously rolling sitely curved tooth on a beveled gear that will mesh with the one shown in full lines being indicated bythe heavy dotted line g4. To permit the cutter spindle 94- to be shifted quickly from one position set screw 159 is loosened and the shaft 135 'turned by its protruding square end in any convenient manner.

`lllhile the Jforegoing description delineates construction, it will be umlerstood that the invention is not 'limited thereto specidcally. Various changes may be made in details of constructionA Without departing trom the underlying principles and reference should be made to the following claims for an understanding of the scope and limits of the invention.

It is to be noted that the angular velocity oi2 the cutting blades is modified by their planetary gear drive during the rolling mo- This modificapositive or negative one. This modiiication. of the indexing motion' of the cutting blades necessitates similar modifica tion or alteration or' the indexing movement ot the blank.. In order to maintain the proper and necessary indexing relation, the fulcrum 36 ot the difierentia-lf lever 56 is set a proportionate amount to ne side or the other ofthe position it would occupy were it not torv the modifying action of the planetary gear drive. Thus the proper indexing and prolile generating movement of the cutter and blank is maintained, andthe lever 56 called upon to perform still another function.

Having thus described my invention, what ters Patent is: f

l. in a curved tooth gear cutting machine, revolvable Work spindle, a revolvable cutspindle, carrying two or more cutting bla es means for rotating said spindles at definite angular velocities' indexing the blank with the cutter whereby all the teeth may be cut in a cycle of operations, and means including a single member for sisjaid blank and cutter in the manner of that the cutters. pass from the outside to the inside of the blank and that they cross the blank towi'ds to the other, the

, and

and desire to. protect by Let-V el'i'ect profile generation. of their teeth.

f2. Ina curved tooth gear cutting a Work spi`ndle,-.,a cutter-spindle`carrying one .or more cutting blades, vandrmeans for indexing relation and simultancously producing a profile generating movement of the blank and cutters after the fashion of intermeshing named means 'including a proportionating mec ianism. modifying the action' .of l:means for continuously indexing the blanks and cutters to simultaneously governv the cutting of the teeth in profile.: i y s 3. In a beveled gear cutting-machine, in combination, a blank carrier, a cutter, means for rotating the carrier and cutter atangular velocities indexing the blank and cutter so as to cut a plurality of teeth -with every revolution of the cutter, and means gears, said' lastl internwshingA gears to machine,

for imparting a profile generating movement cutter and carrier, ,said last named means including Wh .only in proportion to'each other.

4. In beveled rier, a cutter, means for rotatin the carrier and cutter simultaneously in de nite index` ing relation, and profile mechanism for rolling thecarrier and cutter indefinite generating relation including devices movable in one given direction, only during the complete cutting of .a gear. i 5. In a machine for cutting curved tooth beveled gears, in combination, a blank carrier, a cutter, means for rotating the carrier and cutter simultaneously in definite index-l ing relation, and ing the carrier and ycutter in definite generating relation includingr a differential lever proportioning blank and cutter. In a machine for cutting curved tooth beveled gearsrin combination, a blank carrier, a cutter, means for rotating the carrier relation, and profile mechanism for roll ing the carrier .and cutter in definite generating relation including a combined .rack and Worm for rollingthe gear. blank in proportion to the cutter. Y

7 In a machine forcutting curved tooth ing beveled gears, in combination, a blank car` rier, a cutter, means for rotating the carrier and cutter simultaneously 1n definlte lndeX- ing relation, and profile mechanism for roll- 'a transmitting mechanism' ose opposite effective ends'are movable.

profile mechanism for rolli the rollingmovement ofthe .cutter simultaneously in definiteindexing the carrier .and cutter in deinite generating relation including h mediate its ends for proportiomng the'rolling movement of the blank and carrier.

In a machine for' cutting curved tooth beveled gears, in combination, a blank carrier, a cutter, means for rotating the carrier and cutter simultaneously in definite indexva lever pivoted inter? lill lill

` ential lever proportioning the ans for rotating" the carrier and cutter simultaneously in definite index-I` ing; relation, prolile mechanism for rollingJ the carrier and cutter in definite generating relation including adever pivoted inter-ine diete its ends lor proportioning` the rolling moif'enient ol the blank and carrier, and means permitting adjustment ot'said levers ni'vot to vary the relative rolling movement of the cutter and blank.

il. ln a machine for cuttingl curved tooth beveled gears, in combination, a blank carrier, a cutter, nieans t'or rotating the carrier and cutter siniultaneouslj,T in delinite indexing relation, and profile mechanism 'lor rolling the carrier and cutter in definite gencretina' relation including worin-shaped devices ,rerating the blank carrier .and the cutter.

ll. ln a machine for cutting cui-red tooth beveled gears., in combination, a blank. can rior, a cutter, means tor rotating the carrier and cutter simultaneously in definite index-- ing relation, and )oreille mechanism tor rolling the carrier and cutter in definite generU ating, combined rotative endl-lee with respect to its own l 12. ln a machine Yfor cutting curved 'tooth beveled gears, in combination, a, blank carrier, a cutter, means for rotating the carrier and' cutter simultaneously in detinite 4indexing relation, and means for rolling the carrier and cutter indefinite gei'ieratino; relation about independent axes'one ot which is ,veulent noncoinciden with its axis of indexing` ron ion 'he ineans for rotatinrfthe cutter in f rel tonirith the blank including VTheel, cuttenspindle disposed ecv oli said Worninrheel, and rneans shift of the cuttensoindle to wl lll. ln a machine for cutting* curved 'tooth beveled gears, in combination, a blank car rier, acutel', means 'for rotatingr the carrier and cutter sinulltaneously in deiinite indexing relation, and means for rolling' the carrier and cutter in delinite `generating relation about indepeinlent axcs'one ot` vwhich is noncoinfvfident with its axis of indexing rotation, the ineuns 'for rotating; the cutter in ,fr relation with the blank including; e 'olraole about a fixed axis, d ecceietticaln there relation including a rinrnlber having V ,att andv inoepea lll. lin a machine for continuously cutting gear blanks, in combination, a cutter head carrying' a plurality ot' cutters` a spindle supporting said cutter head., ineans for ro tating said spindle, and means irictionally retarding the rotation oi the cutter head and thereby 'taking up lost motion in the means for rotatingV the spindle.

l5. ln a machine tor continuously cutting curved tooth bevel gears, in conibiiultiou, a main shaft` a blank carrier. means tor rotating the blank carrier ironl the main shalt, a cutter, and means for rotating; the cutter from the main shaft and simultaneously moving,` the axis ot' the cutter bodily sido Wise, said last named means including drive shat'ts disposedin parallel and right-anun lar relation only, and mea-ns Yfor transmit tingr the bodily sidewise movement of the cutter axis tothe blank carrier in a prede termined ratio.

lo. ln a machine` for continuouslir cutting curved tooth beveled gears coinpf te in one operation, in combination, a blanlrcarrier, a cutter, means 'tor simultaneously indexing and rolling;A said-carrier and cutter, adjustable ineans for supporting said blank-carrier permitting variation ot its angular.' relation to the cutter, and means fixed to and niorahle with said supporting means l'or proportioning the prolile generating),- movement of the blank carrier to that ot' the cutter.

l?, ln a machine i'or continuously cutting curved tooth beveled gears in one cycle oi operations, in combination, a trarne, a pen pendicular drive shaft, a head s said shalt, a main shaft whose axis is in in tersecting night-angular relation with said perpendicular shalfha blank carrier, a cutter, ineans tior rotating; the carrier and cut ter in detinlite iiulexiifnra relation, means 'for rolling the cutters, and means operativelji,T connected with the last named rolling means and including said 'perpendicular driire shaft viveled upon t'or proportioning the roll of the blank carricr to that yel the Cutter.

18. ln a machine lor cutting; curved tooth beveled in combination, a blank can rier, a cutter, means lior rotating tn carrier and cutter siniultanecaisljffr in definite indefiingy relation, and means for rollingF the carrier and cutter in definite generating` relation about independent axes one of which is noncoincident wi'h its axis ot indexing rotation, the ineans for rotating the cutter in indexing re ation with the blank lncludiiu?J a worm-Wheel rexi'olvable about a fixed axis, a cutter spindle disposed eccentrieally there ot, a main shaft, and means operatively conn necting said niain shaft and cutter spindle. 

